Versatile tunnelling jumbo 26 August 2015

Sandvik Construction adds a completely new and highly versatile tunnelling jumbo to its extensive offering – the fully automated DT922i.

The DT922i is a fully automated electro-hydraulic two-boom tunnelling jumbo with a completely new articulated carrier, and is designed to improve the quality of excavations through its novel automation and planning function. The DT922i has been developed for excavating cross sections up to 125m², including face drilling, bolt hole drilling, and long-hole drilling.

Sandvik DT922i tunnelling jumbo

“If you want a jumbo that will be able to perform all different types of tunnelling excavations, this is the one for you,” said Tommi Salo, Product Line Manager, Tunnelling, Sandvik Construction. “Our aim was to create an all-round jumbo that is high in performance, reliable in use and possesses the same intelligent systems as our other i-series jumbos, but at the same time be able to offer the customer the flexibility they were after in terms of new carrier and improved automation. Looking at the end result, I think we have succeeded very well.”

Maximised versatility

The new articulated carrier enables the jumbo to operate in tight tunnels with narrow corners. A the new optional cabin lifting system gives 25% improved visibility, but at the same time allows the machine to tram in low tunnels. The hydrostatic transmission system and joystick control enables precise dynamic control of tramming speed and steering. The practical multi-voltage concept for different electric voltages allows for easy and fast shifts to different working sites. This is all combined with the efficient RD525 rock drill, intelligent drilling and boom control systems, as well as the iSURE® tunnel management system.

Advanced drilling and boom control systems

Optimised performance with amplified drilling automation comes in the form of the Sandvik Intelligent Control System Architecture (SICA). This is a well-proven and intelligent drilling control system with nine different hole type settings, and three alternative control methods: manual drilling control, feed percussion follow-up, and intelligent torque control. The DT922i also possesses a new easy-to-use boom control system with three different modes for manual boom control. With this new technology the accuracy of drilling is raised to a completely new level.

Double boom enables cross-sectional excavations of 125m²

Automated drill planning

Two automation levels are also offered: gold and platinum. The standard gold package facilitates drilling according to predefined drill plans. This automation level includes features such as drilling to predefined depth, drill plan visualisation, rig navigation and an option for automatic long-hole drilling. It also integrates the iSURE® tunnel management tool for creating accurate plans for drilling, charging and blasting, as well as a data collection and analysis tool for improving work cycle and process. The enhanced platinum package includes all features from the gold package, but enables full automatic face drilling with iDATA.

Efficient drilling

Equipped with the powerful Sandvik RD525 rock drill which provides 17% higher penetration rates, 40% longer tool life for the shank, as well as 17% longer life for the bits (when compared to its predecessors), the DT922i delivers performance in any conditions. Its two accurate SB100i booms are equipped with stiff square shaped profile giving maximised support and precision to the rock drills.

Operator comfort

The DT922i's brand new cabin comes with improved ergonomics and maximised safety. The new design delivers 25% greater visibility sector, reduced dust levels and provides more operator space. With noise levels under 69 dB at all times, it thus supplies a comfortable and safe working environment for the operator. Additionally the new state-of-the-art user interface, with touchscreen, is easy to work displaying comprehensive diagnostics with all drilling and carrier parameters split into logical sub-systems and shown on one display.

EHS features in-built

Environmental, health and safety features include a laser scanner access detection system to optimise personnel safety, a fuel-efficient Tier 3 diesel engine (119 kW) as standard – or the optional Tier 4 Final (122 kW), which reduces emissions even further.